Associating ROM file extensions with Retroarch in Windows + automatic core selection

[boomercore]

For years I've had to contend with using an app called Default Programs Editor
with strings such as "E:\Emulation\Emulators\RetroArch-Win64\retroarch.exe" -L "E:\Emulation\Emulators\RetroArch-Win64\cores\bsnes_accuracy_libretro.dll" "%1" to run ROMs straight from whatever folder they're in and have Retroarch load up the right core.

Could auto-core functionality be added whenever a ROM is directed to retroarch.exe without -L please? Or if there's more than one core capable, a selection prompt? I prefer to use Retroarch for its emulation functionality, enhancement features, and lag mitigation over its ability to browse ROMs. File indexing + Start Search can do this job far better, and I can use a context menu random file selection script from within folders too. Having to futz with this on every installation is a bit of a pain. Thanks in advance.

[RobLoach]

Dup #9718